2027 ICD-10-CM Diagnosis Code N15.9Renal tubulo-interstitial disease, unspecified
ICD-10-CM Codes›N00–N99›N10-N16›N15
- Billable — Valid for Submission
- Chronic Condition
N15.9 is a billable ICD-10-CM diagnosis code for renal tubulo-interstitial disease, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 698 through 700. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nephritis; nephrosis; renal sclerosis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- BK virus nephropathy
- Disease caused by BK polyomavirus
- Hereditary tubulointerstitial disorder
- Infectious disorder of kidney
- Perinephritis
- Postoperative urinary tract infection
- Post-renal transplant nephropathy caused by BK polyomavirus
- Post-renal transplant nephropathy caused by BK polyomavirus Banff class 1
- Post-renal transplant nephropathy caused by BK polyomavirus Banff class 2
- Post-renal transplant nephropathy caused by BK polyomavirus Banff class 3
- Renal impairment caused by Polyomavirus
- Tubular renal disease with cardiomyopathy syndrome
- Viral kidney infection
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to N15.9: its own notes plus those printed at block N10-N16 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Infection of kidney NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- urinary tract infection NOS (N39.0)
- pyeloureteritis cystica (N28.85)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disease, diseased See Also: Syndrome;
tubulo-interstitial N15.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Kidney Diseases
You have two kidneys, each about the size of your fist. They are near the middle of your back, just below the rib cage. Inside each kidney there are about a million tiny structures called nephrons. They filter your blood. They remove wastes and extra water, which become urine. The urine flows through tubes called ureters.
Read the full article at MedlinePlus
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Convert N15.9 to ICD-9-CMHistory
Code HistoryHistory
Questions About N15.9Overview
What is the ICD-10 code for renal tubulo-interstitial disease, unspecified?
The ICD-10-CM code for renal tubulo-interstitial disease, unspecified is N15.9 (sometimes written as N159). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is N15.9 (Other renal tubulo-interstitial diseases) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report renal tubulo-interstitial disease, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does N15.9 group to?
When renal tubulo-interstitial disease, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 699, 698, 700, with relative weights from 0.6740 to 1.6400 depending on complications. Higher weights mean higher Medicare reimbursement.
Can N15.9 be reported with N39.0?
Not as a rule. The Excludes1 note on N15.9 lists "urinary tract infection NOS (N39.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of N15.9?
Under the General Equivalence Mappings, renal tubulo-interstitial disease, unspecified converts to ICD-9-CM 583.9 (nephritis NOS) and 590.9 (infection of kidney NOS). The mapping is approximate, so confirm the match fits the documentation.
